동북아와 한반도 : 一. 동북아 국제체계의 현황과 전망 The Northeast Asian International System;Present & Future

이원미 이화여자대학교 법정대학 정치외교학과 1977 정치외교연구 Vol.5 No.-

메틸렌블루와 바나듐을 활물질로 활용한 수계 유기 레독스 흐름 전지의 성능 평가

이원미,권용재 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.6

In this study, methylene blue which is one of dye materials was introduced as active material for aqueous redox flow battery. The redox potential of methylene blue was shifted to negative direction as pH increased. The full-cell performance was evaluated by using methylene blue as the negative active material and vanadium as the positive active material with acid supporting electrolytes. The cell voltage of methylene blue/V4+ is very low (0.45 V). In addition, the maximum solubility of methylene blue in water is only 0.12 M. Therefore, the cell test was performed with very low concentration (0.0015 M methylene blue, 0.15 M V4+) at first time. Cut-off voltage range was 0 to 0.8 V and 1 mA·cm-2 current density was adopted during cycling. As a result, current efficiency (CE) was 99.67%, voltage efficiency (VE), 88.83% and energy efficiency (EE) was 85.87% and discharge capacity was (0.0500 Ah·L-1) at 4 cycle. In addition, the cell test was performed with increased concentration (0.1 M methylene blue, 0.15 M V4+) with 10 mA·cm-2 current density, leading to higher discharge capacity (3.8122 Ah·L-1) with similar efficiency (CE=99%, VE=85%, EE=85% at 4 cycle). 본 연구에서는 염료 물질 중 하나인 메틸렌 블루(methylene blue)를 수계 레독스 흐름 전지의 활물질로 처음으로 도입하였다. Methylene blue의 레독스 전위는 pH가 높아짐에 따라 음의 방향으로 이동하는 것을 확인할 수 있었다. 이methylene blue를 음극 활물질로 활용하고, 양극 활물질로는 바나듐(vanadium) 을 활용하여 산 전해질을 기반으로 셀성능 평가를 진행하였다. Methylene blue/V4+ 레독스 조합의 산 전해질에 대한 셀 전압은 0.45 V로 낮으며, Methylene blue의 물에 대한 용해도 또한 0.12 M로 굉장히 낮다. 이에 따라 0.0015 M의 낮은 농도로 단전지 셀 성능을 평가하였으며, Nafion 212 멤브레인을 사용하여 0~0.8 V 컷-오프 전압으로 1 mA/cm2 전류밀도 하에서 4 cycle에서 충방전 효율 96.67%, 전압효율 88.83%, 에너지효율 85.87%, 방전 용량(0.0500 Ah·L-1)의 성능을 보였으며, 낮은 방전용량은 활물질의 낮은 농도에 의한 것이므로 활물질인 메틸렌 블루의 농도를 0.1 M로, 전류밀도는 10 mA/cm2로 더 높였을 때4 cycle에서 CE 99%, VE 85%, EE 85%의 효율로 더 높은 방전 용량(3.8122 Ah·L-1)을 도출함을 확인할 수 있었다.

안트라퀴논과 템포 활물질 기반 수계 유기 레독스 흐름 전지에서의 멤브레인 효과

이원미,권용재 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.5

In this study, the evaluation of performance of AORFB using anthraquinone derivative and TEMPO derivative as active materials in neutral supporting electrolyte with various membrane types was performed. Both anthraquinone derivative and TEMPO derivative showed high electron transfer rate (the difference between anodic and cathodic peak potential was 0.068 V) and the cell voltage is 1.17 V. The single cell test of the AORFB using 0.1 M active materials in 1 M KCl solution with using Nafion 212 membrane, which is commercial cation exchange membrane was performed, and the charge efficiency (CE) was 97% and voltage efficiency (VE) was 59%. In addition, the discharge capacity was 0.93 Ah·L-1 which is 35% of theoretical capacity (2.68 Ah·L-1) at 4th cycle and the capacity loss rate was 0.018 Ah·L-1/cycle during 10 cycles. The single cell tests were performed with using Nafion 117 membrane and SELEMION CSO membrane. However, the results were more not good because of increased resistance because of thicker thickness of membrane and increased cross-over of active materials, respectively. 본 연구에서는 유기물인 안트라퀴논(AQDS)와 템포(TEMPO) 를 활물질로 사용하고 N 중성 전해질 기반 수계 유기레독스 흐름전지 성능이 멤브레인에 따라 어떻게 영향을 받는지 분석하였다. 안트라퀴논과 템포 모두 중성 전해질인염화칼륨(KCl) 전해질에 대해 높은 전자전달성(0.068 V의 산화 반응 및 환원 반응의 피크 전위차) 및 셀전압(1.17 V)을얻을 수 있었다. 성능비교를 위해 사용한 멤브레인으로, 상용 양이온 교환막 중 하나인 Nafion 212를 사용하였을 때, 0.1 M 활물질을 1 M 염화칼륨 전해질에 용해해서 작동한 레독스 흐름전지 완전지 테스트를 통해, 전류효율 97%, 전압 효율 59%의 성능을 나타내었지만, 방전 용량(discharge capacity)은 4 사이클에서 0.93 Ah·L-1로 이론 용량(2.68 Ah·L-1)의 35%를 도달하였으며, 총 10사이클 동안 방전 용량의 용량 손실율(capacity loss rate)은 0.018 Ah·L-1/cycle 이다. 그 외에도 Nafion 117 멤브레인, SELEMION CSO 멤브레인을 사용하여 단전지 성능을 테스트하였을 때, 오히려 저항 증가 및 투과 유도로 인해 더 큰 용량 손실을 이끌었다.

딥 러닝 기반 객체 탐지를 활용한 배너 이미지 생성 프로세스

공형준(Hyeongjun kong),한혁(Hyuck Han),강수용(Sooyong Kang) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.12

石榴葉의 Plastid 硏究 및 生藥學的考察

李園美 숙명여자대학교 1966 藥硏 Vol.2 No.-

염화암모늄 전해질에 포함된 퀴논 레독스 활물질 조합을 이용한 수계 레독스 흐름 전지 성능 평가

이원미,정건용,권용재 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.2

In this study, anthraquinone-2,7-disulfonic acid (2,7-AQDS) is used as negative active material and Tiron is used as positive active material for aqueous redox flow battery (RFB). In previous results that used the 2,7-AQDS and Tiron, sulfuric acid (H2SO4) was a supporting electrolyte. However, in this study, ammonium chloride (NH4Cl) is suggested as the electrolyte for the first time. By changing the supporting electrolyte from H2SO4 to NH4Cl, the cell voltage of RFB is improved from 0.76 V to 1.01 V. To investigate the effect of NH4Cl supporting electrolyte of the performance of RFB, the full-cell tests of RFB using 2,7-AQDS and Tiron that are dissolved in NH4Cl supporting electrolyte are carried out, while cut-off voltage range is a main parameter to determine their performance. When the cut-off voltage range is 0.2~1.6 V, the hydrogen evolution occurs during charging step. To address the side reaction effect, the cut-off voltage range is changed to 0.2~1.2 V. When the revised cut-off voltage range is used and the current density of 40 mA/cm2 is applied, hydrogen evolution is not observed and the optimal RFB shows the charge efficiency of 99% and discharge capacity of 3.3 Ah/L at 10cycle. 본 연구에서는 Anthraquinone-2,7-disulfonic acid (2,7-AQDS)와 Tiron을 수계 레독스 흐름 전지 음극 및 양극 활물질로 사용하며 기존의 황산 전해질 대신 중성인 염화암모늄 (NH4Cl)을 전해질로 도입하였다. 이렇게 전해질을 변경함으로써, 황산 전해질의 낮은 셀 전압(0.76 V)을 1.01 V까지 향상시킬수 있다. 성능 최적화를 위해 염화암모늄 전해질에0.1M로 활물질 농도를 맞춰 컷-오프 전압에 변화를 주며 완전지셀 성능을 평가하였다. 0.2~1.6 V 구간의 컷-오프 전압으로 40 mA/cm2하에서 20 사이클 동안 완전지셀을 테스트한 결과, 충전 동안 수소가 발생하였다. 이에 컷-오프 전압 조절로 충전 전압을 낮춰서 수소 발생을 제한하고자 0.2~1.2 V 구간으로 40 mA/cm2하에서 완전지셀 테스트를 진행하였다. 수소 발생은 없었으며, 전류 효율 99%, 방전 용량 3.3 Ah/L의 성능을 보였다.

여성 운동선수의 성역할 갈등이 객체화된 신체의식 및 신체존중감에 미치는 영향

이원미,이종영 한국스포츠학회 2013 한국스포츠학회지 Vol.11 No.1

다공성 금속 촉매에 의한 레독스 흐름전지의 특성평가

이원미,조창신,이진우,정용진,권용재 한국에너지학회 2017 한국에너지공학회 학술발표회 Vol.2017 No.9

여성 퍼스널 트레이너의 몸 관리와 자리매김하기

이원미 한국사회체육학회 2018 한국사회체육학회지 Vol.0 No.72

This study develops a substantive theory by analyzing how wome npersonal trainers perceive and interpre t body management, and how they establish themselves as personal trainers. The study subjects were limited to women personal trainers who had experiences of participating in a body fitness competition. The author selected the subjects by snowball sampling which is used for quiataltive studies. They were recommended by a female personal trainer who was the author’s long-time acquainatnce. After the subjects received explanation on the intention of the study, 8 subjects who had intention top articipate in the study were selected. For th e data collection, the non-participant observation and in-depth interview were conducted. The data analysis was conducted according to open coding, axial coding and selectivec oding which were provided by Strauss and Corbin (1998). In the source data collected by the in-depth inetrview, 81 concepts, 15 subcategories and 9 upper categories were derived. The central phenomena were found to be body management and participating competitions, and the causal situations for these phenomena weer prejudice and anxiety for the occupation . These causal situations reflected context situations of body mnaagement fever and career building. In add-i tion, the subjects gave effort to manage their bodies and adapt to be a personal trainer based on interventional conditions such as achieving recognition or self-satisfaction. With interactive strategies such as seeking fun in body management and having self-esteem, they established themselves as women personal trainers . Their experiences of body management had positive effects on etasblishing themselves as trainers while they instructed the fitness center members using their experiences.T hese experiences are the driving force tha t makes the subjects continue body management. These become their own ability, which can be the strategy to establish themselves as women trainers in the male-oriented world of trainers.

세침흡인 세포검사에서 인환세포가 주세포인 유방의 침윤성암종 2예 보고

이원미,김완섭,김은경,주종은,Lee, Won-Mi,Kim, Wan-Sup,Kim, Eun-Kyung,Joo, Jong-Eun 대한세포병리학회 2002 대한세포병리학회지 Vol.13 No.2

Scattered single cells or variable sized clusters of signet ring cells in the aspirated smears of breast lesions are almost exclusively associated with carcinoma. The signet ring cells are defined as those containing a prominent intracytoplasmic vacuole or amorphous cytoplasm diffusely dispersed with mucin. The primary signet ring cell carcinoma of the breast behaves more aggressively than carcinoma without signet ring cells. Therefore, it is very important to make a correct diagnosis of signet ring cell carcinoma. Fine needle aspiration cytology is useful for diagnosis of breast lesions Including signet ring cell carcinoma. We report two cases, which showed mostly signet ring cells in the aspirated smears of the breast. One case consisted of numerous individual signet ring cells and variable sized cell clusters in rather mucoid background. The tumor cells had abundant amorphous cytoplasm filled with dispersed mucin or occasionally mucin vacuoles(PAS +) and eccentric nuclei. The resected mass revealed mucinous carcinoma. The other showed the cytologic findings of low cellularity, and small loosely cohesive signet ring cell clusters with mild nuclear pleomorphism. It was confirmed as lobular signet ring cell carcinoma in the resected tumor.